keith3267 wrote:

There is certainly a misconception about the old interlace standard. A lot of people think that the picture is a 480 line picture transmitted in two parts, that is not true. It was a 240 line picture transmitted twice. The cameras of the period were only able to capture a 240 line picture every 1/30th of a second, but it was transmitted twice in that timeframe to reduce visible flicker on the TV set.

There's a name for the 240-line analogue video transmitted twice... I think they used to call it "industrial sync". In other words, even at the time it was something not adequate for broadcast use, but if you were a factory looking for a camera so that the night watchperson could more easily keep an eye on the place, for that it might do.